On Mon, 2016-09-19 at 11:29 -0400, Dave Lugo wrote:

> Yes, you should have some way to override the missing rDNS check.  But
> rejecting on missing rDNS is mostly safe, in my opinion and experience.

Agreed. Only positive action will reduce spam. Meekly accepting spam
just encourages more spam.

#############################################################
#                                                           #
#              Start SMTP Connexion : section [A]           #
#                                                           #
#############################################################

acl_check_connection:

accept  hosts     = EXDIR/hosts.accept.a

drop   hosts      = EXDIR/hosts.amateur.spammer
       message    = [SNA01] Your mailserver is on our Spammers list.
MESS3
       delay      = 30s

drop   hosts      = EXDIR/hosts.professional.spammer
       message    = [SNA15] Your professional spam is prohibited. MESS3
       delay      = 30s

drop   condition  = ${lookup dnsdb{ptr=$sender_host_address} {0}{1} }
       message    = [SNA03] Rejected. Sender's IP address has no Host
name. \
                    MESS3
       delay      = 15s

drop   condition  = ${if and{{def:sender_host_address}{!
def:sender_host_name}} \
                       {yes}{no}}
       message    = [SNA04] Sender's Host has No Reverse DNS. \
                    Ask your technical experts to rectify the problem. 

drop   condition  = ${if match{$sender_host_name} \
                    {^.*[0-9]+[\\-|\\.|_][0-9]+[\\-|\\.|_][0-9]+[\\-|\
\.|_]*.*}}
       !hosts     = EXDIR/hosts.a8
       message    = [SNA08] mail server host name not genuine? MESS3


drop   condition  = ${if match{${lc:$sender_host_name}} \
 {(broadband|client|customer|dsl|dyn|dynamic|home|host|static|user)(\\d|
\\.|\\-|ip)} \
                      {1}{} }
       condition  = ${if match{${lc:$sender_host_name}}
{smarthost}{0}{1} }
#                   note {0}{1} = non-match
       !condition = ${if match{${lc:$sender_host_name}} {mailhost} }
       !hosts     = EXDIR/hosts.a13
       message    = [SNA13] Your mail server's host name,
$sender_host_name, \
                    resembles a home Internet connection. MESS3


etc ..................

[SNA13] = error code.
SN = 1 digit server (MTA) number
A = ACL section reference code
13 = routine with an ACL section

[2D16] = MTA 2, ACL section 'D', routine 16



-- 
Regards,

Paul.
England, EU.      England's place is in the European Union.


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